32results about How to "Multiple attachment sites" patented technology

The invention discloses a hydrogen production catalyst by hydrolysis of sodium borohydride, a preparation method and an application thereof, belonging to the field of catalyst synthesis. In the preparation method of the present invention, the phosphoramidate chelating resin is used as a carrier to load Ni, Co or NiCoP composite active components, and nickel ions, cobalt ions or both enter into the phosphoramidate chelating resin inside by electrostatic attraction and group force. In the pores, and strongly coordinate with the nitrogen-containing ligands, so that they are distributed and fixed inside the resin, forming stable resin-nickel ions, resin-cobalt ions, resin-cobalt ions / nickel ion complexes; heat treatment of the above complexes , nickel ions, cobalt ions or a mixture of the two loaded on the aminophosphoric acid chelating resin form Ni with phosphorus source 2 P. Co. 2 P or NiCoP compound, and itself is carbonized to change the carbon support. The preparation method of the invention has mild conditions, low cost and high yield, is beneficial to industrialized production, and does not cause environmental pollution.

A based on ZnO microspheres and CsPbBr 3 Room temperature NO of quantum dot heterostructure composites 2 A sensor and a preparation method thereof belong to the technical field of semiconductor oxide gas sensors. A ceramic substrate with metal interdigitated electrodes and ZnO microspheres and CsPbBr coated on the metal interdigitated electrodes 3 Composition of sensitive layer of quantum dot heterostructure composite material. The morphology of zinc oxide is a sphere structure, which has a large specific surface area and can provide more attachment sites, so that it can be combined with the smaller perovskite CsPbBr 3 The quantum dots are in full contact, so that a gas sensor with better gas sensor response and faster response recovery speed can be obtained. In addition, CsPbBr 3 As an excellent photoelectric material, quantum dots can absorb visible light, thereby providing more photogenerated carriers. The sensor of the present invention adopts a planar structure, has simple process, short production period, and is suitable for mass production.

The invention discloses a polylactic acid / ZIF-8@C600 composite material and a preparation method and application thereof. The composite material is prepared from polylactic acid and ZIF-8@C600 composite nano modifier which are carbon black particles with ZIF-8 loaded on the surfaces in the mass ratio of (99.9-99.0):(0.1-1.0). Accordingly, a solution blending method is adopted, a polylactic solution and ultrasonic dispersion liquid of dichloromethane of the ZIF-8@C600 composite nano modifier are blended in proportion, and the composite material is obtained through an electrospinning method. Thehydrophobic property and oil absorbency of the composite material are obviously improved, and meanwhile the oil-water separation performance is achieved; in addition, the product is biodegradable, safe, reliable, free of peculiar smell and low in damage and pollution degree to the human body and environment.

The invention discloses a high-strength wear-resistant closed steel frame and its processing technology. During the preparation, the surface of the alloy steel pipe fitting is cleaned by laser, and the surface of the alloy steel pipe fitting is cleaned by laser to remove the oxide film on the surface to improve the surface. Wettability, in the subsequent laser cladding process, the cladding liquid can be fully spread, and the subsequent wear-resistant layer is more uniform and dense, with fewer pores and better wear resistance; at the same time, the surface of the alloy steel will form a rough structure after laser cleaning , can improve its surface roughness, and further improve the adhesion of the thick laser cladding layer, so as to improve the comprehensive wear resistance of alloy steel. The process design of the application is reasonable, and the operation is simple. The prepared alloy steel pipe fittings form a wear-resistant layer on the surface, and the steel frame is obtained by splicing and installing. The wear-resistant layer can effectively improve the wear resistance and comprehensive mechanical properties of the alloy steel frame. The alloy steel frame It can be applied to multiple technical fields and has high practicability.

Micron hollow porous composite spherical sodium ion battery positive electrode material and preparation method thereof, the positive electrode material is a micron-sized hollow porous composite spherical structure, which is self-assembled by a sheet structure and a needle structure, and the chemical formula is Na x mn 1‑y‑z Ni y co z o 2 , wherein 0<x≤1, 0≤y≤1, 0≤z≤1, 0≤y+z≤1; the present invention also includes the preparation method of the positive electrode material of the battery. The hollow sphere structure of the positive electrode material of the present invention shortens the deintercalation path of sodium ions; the needle-like structure provides more attachment sites for sodium ions, and is conducive to preventing the agglomeration between particles; the porous structure is beneficial to the material and the conductive agent and The contact of the electrolyte improves the conductivity of the electrode made of the material; the positive electrode material of the battery has good structural stability, and the battery rate performance of the electrode assembly made of the material is good; the method of the invention is simple in process, and the required equipment is different from the existing one. The industrialized lithium cobaltate and nickel-cobalt-manganese ternary cathode materials have the same process, and can be directly produced by existing production lines.

The invention relates to the technical field of microbial immobilization, in particular to a preparation method for a microbial carrier. A porous cotton straw is used as a template, EDTA (Ethylene Diamine Tetraacetic Acid) is taken as a guiding agent to improve the purity of hydroxy calcium phosphate, a porous high-capacity hydroxy calcium phosphate carrier is prepared, mosses are loaded on the surface of the porous high-capacity hydroxy calcium phosphate carrier to provide places and nutrition for the growth of microorganisms, and good mechanical performance and excellent biocompatibility of the hydroxy calcium phosphate are used for finally preparing the microbial carrier with high biological capacity. The defects of poor mechanical performance, low biocompatibility and small biological capacity of a common microbial carrier are eliminated, and the microbial carrier with the high biological capacity has a wide application prospect.

The invention belongs to the field of tissue engineering scaffold materials, and provides a bionic composite scaffold material doped with graphene and an establishment method of the bionic composite support material. The establishment method comprises the following steps: firstly preparing a Cs acetic acid solution, a GP aqueous solution, a Gel aqueous solution and a graphene suspension, and thenmixing the Cs acetic acid solution and the GP aqueous solution to prepare a Cs / GP solution A; adding the Gel aqueous solution into the Cs / GP solution A to prepare a Cs / GP / Gel solution B; and adding the graphene suspension into the Cs / GP / Gel solution B to prepare a Cs / GP / Gel / Gr solution C, transferring the solution C into a low-temperature mold, freeze drying at a low temperature, and performing the subsequent treatment, thus obtaining the bionic cartilage composite support material. A mass ratio of chitosan Cs to beta-sodium glycerophosphate GP to gelatin Gel to graphene Gr in the bionic cartilage composite scaffold material is 1: (5 to 20): (1 to 5): (0.02 to 0.08). The bionic composite scaffold material has the advantages of simple process, easy control and low production cost; and a produced support product is uniform in porosity, has an inter-connective pore structure and has an excellent bionic effect.

The invention belongs to the technical field of sewage treatment, and relates to a preparation method and application of graphene oxide. First, graphite powder is added to a beaker containing concentrated sulfuric acid for pre-oxidation; then potassium permanganate is added to the beaker in an ice-water bath and stirred, After removing the ice-water bath, add deionized water at room temperature for stirring; then add saturated hydrogen peroxide solution slowly until the color of the mixture turns golden yellow and then stir; finally, wash the mixture, centrifuge, dialysis and freeze-drying in sequence. The brown-yellow flocculent graphene oxide is prepared. The whole preparation process does not require complicated temperature control, the operation is simple, and there is no high-temperature production stage, the production safety factor is improved, and the production cost is reduced. It has good strengthening performance for anammox bacteria, is suitable for industrial production, and has good economic and environmental benefits.

The invention relates to a method for in situ synthesis of TiO2@Ti3C2 through the intercalation and layering of hydrazine hydrate and a product. The synthetic method comprises the following steps: (1)dispersing Ti3AlC2-MAX-phase ceramic powder into an HF solution, and etching, so as to obtain Mxene-Ti3C2; (2) dispersing Mxene-Ti3C2 into hydrazine hydrate, carrying out hydrazine hydrate intercalation, so as to obtain hydrazine hydrate intercalated Ti3C2; (3) dispersing hydrazine hydrate intercalated Ti3C2 into water, carrying out ultrasonic treatment in an argon atmosphere, and drying, so as to obtain hydrazine hydrate intercalated and layered Ti3C2; and (4) carrying out in situ oxidation on hydrazine hydrate intercalated and layered Ti3C2, so as to obtain TiO2@Ti3C2. According to the method, the interlayer spacing of Mxene-Ti3C2 is increased through hydrazine hydrate and ultrasonic treatment, so that more attachment sites are provided for generated TiO2, and the catalytic degradationof pollutants is promoted.

The invention belongs to the technical field of new materials, and provides an in-situ preparation method of a Ni / NiO composite material and application thereof. The preparation method comprises the following steps: (1) fully dissolving a nickel source in an inorganic solvent to form a solution A; (2) adding a strong reducing agent into the solution A to form a mixed solution; (3) performing hydrothermal reaction on the mixed solution obtained in the step (2) to obtain a solid-liquid mixture, and separating, washing and drying the solid-liquid mixture to obtain a precursor I; (4) performing high-temperature thermal decomposition reaction on the precursor I in the step (3) to obtain a precursor II; (5) reducing the precursor II in the step (4) under a reducing gas atmosphere to obtain the Ni / NiO composite material. According to the method, the metal content is easy to control, and the metal dispersivity is relatively high, and a relatively strong interaction exists between a metal and acarrier, so that the number of active sites is increased, and transferring of electrons in the reaction is promoted; therefore, the Ni / NiO composite material with relatively high activity and stability is obtained.

The invention relates to a self-supporting electrode material and its preparation method and application, belonging to the field of electrode materials. The self-supporting electrode material prepared by the present invention is composed of nanoparticles with a diameter of about 30-60nm gathered together, and coated with a layer of nano-film on the outside to form a nano-spherical structure. The electrode material prepared by the present invention has excellent electrochemical performance, exhibits good electrocatalytic performance in the battery, and also avoids side reactions and poor cycle performance of the lithium-oxygen battery due to the use of carbon materials and binders in the charging process. question.